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In a disheartening signal to world powers at upcoming Iran talks, Tehran has started installing high-tech machines at its main uranium enrichment site that are capable of accelerating production of reactor fuel and — with further upgrading — the core of nuclear warheads, diplomats said Wednesday.

Iran already announced last week that it had begun mounting the new enriching centrifuges, but one diplomat said at the time that the announcement was premature with only a “small number” on site and not yet installed.

Diplomats told The Associated Press on Wednesday, however, that installation was now well on its way, with inspectors from the International Atomic Energy Agency seeing close to 100 or more machines mounted when they toured the site a few days ago. Depending on experts’ estimates, the new-generation centrifuges can enrich uranium three to five times faster than Iran’s present working model.